Fusion secondary current loop direct current resistance test and fixed detection test method and fusion secondary current loop direct current resistance test and fixed detection test system

Abstract

The invention discloses a method and a system for integrating secondary current loop direct current resistance test and fixed detection test, and relates to the technical field of power grid loop detection, and the method comprises the steps: switching a function module of an instrument to a load test module, and carrying out the internal function verification of the device; a function module of the instrument is switched to a resistance test module, the integrity of a secondary current loop is judged through the direct resistance value difference of the secondary current loop, and the state of secondary wiring is judged through an insulation resistor; the functional module of the instrument is switched to the conduction test module, and the core before secondary wiring is tested to ensure that the wiring at the two ends of the cable is consistent. The device is portable and can be conveniently carried to the site for effective verification, the efficiency of regular verification of the secondary monitoring protection equipment is greatly improved, it can be ensured that the secondary monitoring protection equipment is safely and reliably put into operation, the blank that no professional detection tool exists in the aspect of secondary detection of the integrity of a current loop is filled, and the practicability is high. The problems that current secondary current loop detection work is incomplete, and hidden dangers existing in a secondary current loop cannot be found in time are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid loop detection, and in particular to a method and system for integrating direct resistance test and fixed detection test of a secondary current loop. Background Art

[0002] With the rapid development of society, the demand for power quality is gradually increasing, which requires the reliability of power supply of the power grid to be guaranteed, the fault of the power grid to be isolated in time, and the scope of power outage to be avoided. Therefore, the secondary monitoring and protection equipment of the power grid is required to function normally to monitor and protect the operation status of the primary equipment of the power grid. Among them, the secondary current, voltage and circuit breaker control circuits of the secondary monitoring and protection equipment are particularly important, which can directly determine whether the secondary monitoring and protection equipment is operating normally. Therefore, every time the secondary monitoring and protection equipment is inspected and inspected, the maintenance team is strictly required to inspect and maintain these three circuits, discover hidden dangers in time and deal with them, so as to improve the safety and reliability of power supply of the power grid.

[0003] The regular test instruments commonly used at present mainly focus on the verification of the functions of the secondary monitoring and protection equipment. The insulation resistance of the control circuit and the integrity of the secondary current circuit need other instruments to complete. Among them, the integrity of the secondary current circuit is crucial and can affect whether the protection function can work correctly. The current detection method mainly uses the resistance gear of the multimeter for detection. However, due to the low power of the multimeter test, there will be errors in the detection process and the waiting time for the test results is long, which increases the time for repairing the secondary monitoring and protection equipment, which is not so convenient for the maintenance team to use.

[0004] In order to solve these problems, it is necessary to design a device that can quickly and conveniently test the direct resistance of the three-phase current loop in a short time and automatically record the data. It can also add AC current and voltage to perform functional inspection of the secondary monitoring and protection device. It also has the function of testing the insulation of the control loop. Maintenance personnel do not need to bring a lot of instruments and equipment, and can complete the inspection conveniently and efficiently, reducing the burden on maintenance personnel. It can also accurately find out whether there are hidden dangers in the loop and ensure the reliability of power supply. Summary of the invention

[0005] In view of the above-mentioned problems, the present invention is proposed.

[0006] Therefore, the technical problem solved by the present invention is: how to monitor and protect the operating status of the primary equipment of the power grid, isolate the fault of the power grid in time, avoid expanding the scope of power outage, quickly and conveniently test the direct resistance of the three-phase current loop in a short time and automatically record the data, and add AC current and voltage to perform functional inspection of the secondary monitoring and protection device. It also has the function of testing the insulation of the control loop. Maintenance personnel do not need to bring a lot of instruments and equipment, and can complete the inspection conveniently and efficiently, reducing the burden on maintenance personnel, and can accurately find out whether there are hidden dangers in the loop to ensure power supply reliability.

[0007] To solve the above technical problems, the present invention provides the following technical solutions: a method integrating direct resistance test and regular inspection test of a secondary current loop, comprising: switching the functional module of the instrument to the load test module to perform internal function verification of the device; switching the functional module of the instrument to the resistance test module to judge the integrity of the secondary current loop by the difference in the direct resistance value of the secondary current loop, and judging the status of the secondary wiring by the insulation resistance; switching the functional module of the instrument to the conduction test module to test the core before connecting the secondary wiring to ensure that the wiring at both ends of the cable is consistent.

[0008] As a preferred scheme of the integrated secondary current loop direct resistance test and fixed inspection test method described in the present invention, wherein: the internal function check of the device includes opening the corresponding voltage and current terminal connectors at the panel cabinet where the secondary monitoring and protection equipment is located, and according to the fixed parameters of the secondary equipment, using the current output port and voltage output port of the instrument to output AC voltage and current greater than the fixed parameters, simulating the AC current and voltage sampling collected by the secondary equipment when a primary equipment fails. At this time, the secondary equipment should protect and trip at the outlet to verify that the protection function of the secondary equipment is correct and can operate normally in the power system. If the protection fails and the outlet trips, further investigation is carried out.

[0009] As a preferred scheme of the integrated secondary current loop direct resistance test and regular inspection test method described in the present invention, the further investigation includes verifying whether there is a device plug-in failure. If there is a device plug-in problem, the power outage time of the equipment is extended or the faulty plug-in is replaced in time to avoid the secondary equipment refusing to operate or malfunctioning to expand the power outage scope. If there is no plug-in failure, it is necessary to check whether the functional input wiring of the secondary equipment is loose. After determining that the problem has been solved, proceed to the next step.

[0010] As a preferred solution of the integrated secondary current loop direct resistance test and fixed inspection test method described in the present invention, wherein: the integrity of the secondary current loop is broken, including switching the DC resistance test module, passing a DC current into the secondary current loop of the secondary monitoring and protection equipment, and stably and accurately measuring the resistance values ​​of the three-phase current loops A, B, and C respectively, and comparing the direct resistance value differences of the secondary current loops of the three phases A, B, and C. When the deviation between the direct resistance values ​​of the three-phase secondary current loop is greater than 1Ω or the direct resistance value of the three-phase current loop is greater than 1MΩ, it proves that the current secondary current loop is incomplete, and the action from the current transformer body inspection to the secondary monitoring and protection equipment is executed, otherwise proceed to the next step;

[0011] Switch to the insulation resistance test module and use 1000V to measure the insulation resistance of the loop to ground and each other. When the resistance is less than 1MΩ, it means that the secondary wiring has insulation aging damage. At this time, replace the spare core of the cable or re-lay the cable to avoid DC grounding or circuit breaker malfunction. If the resistance is greater than or equal to 1MΩ, proceed to the next step.

[0012] As a preferred scheme of the integrated secondary current loop direct resistance test and regular inspection test method described in the present invention, wherein: the inspection from the current transformer body to the secondary monitoring and protection equipment includes first opening the secondary current loop terminal connecting piece at the current transformer terminal box of the secondary equipment, and then using an instrument to test the direct resistance of the secondary current loop from the current transformer to the terminal box. If the test is qualified, it is necessary to tighten the secondary current loop connection from the terminal box to the panel cabinet. If the test result is still consistent with the previous one, it is necessary to first check whether the secondary connection of the current transformer body is loose. If the test result does not change after tightening, the current transformer manufacturer needs to conduct an in-depth inspection to avoid affecting the normal operation of the secondary equipment.

[0013] As a preferred scheme of the integrated secondary current loop direct resistance test and fixed inspection test method described in the present invention, the core detection before secondary wiring includes, checking all secondary wires in the secondary cable in turn, grounding one side of the secondary wire of the cable, and using the test line of the instrument to measure whether the secondary wire on the other side is conductive to the ground. If not, it proves that they are not the same secondary wire and cannot be connected to the secondary loop.

[0014] Another object of the present invention is to provide a system that integrates direct resistance testing and fixed-time testing of a secondary current loop, which can perform testing based on the original device without adding additional devices and has a simple structure and is easy to carry.

[0015] To solve the above technical problems, the present invention provides the following technical solutions: a system integrating direct resistance test and fixed inspection test of secondary current loop, comprising: a load test module, a resistance test module and a continuity test module; the load test module is used to perform internal function verification of the device; the resistance test module comprises a direct current resistance test module and an insulation resistance test module, the direct current resistance test module is used to judge the integrity of the secondary current loop, and the insulation resistance test module is used to judge the status of the secondary wiring; the continuity test module is used to test the core before connecting the secondary wiring to ensure the consistency of the wiring at both ends of the cable.

[0016] A computer device includes a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the method for integrating the direct resistance test and the fixed detection test of a secondary current loop are implemented as described above.

[0017] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the method for integrating a secondary current loop direct resistance test and a fixed detection test as described above.

[0018] Beneficial effects of the present invention: The method and system for integrating direct resistance test and regular inspection test of secondary current loop provided by the present invention not only has functional inspection of secondary monitoring and protection equipment but also external loop, and not only covers some functional tests not covered by relay protection instrument, but also is light and convenient to carry to the site for effective inspection, which greatly improves the efficiency of regular inspection of secondary monitoring and protection equipment, and can also ensure that the secondary monitoring and protection equipment is put into operation safely and reliably, fills the gap of lack of professional inspection tools for the integrity of secondary current loop, and solves the problem that the current secondary current loop inspection work is incomplete and the hidden dangers of the secondary current loop cannot be discovered in time;

[0019] It is convenient for maintenance personnel to carry out regular inspections on site. They do not need an external power supply or a lot of instruments and equipment to complete the main items required for regular inspections. They can timely discover hidden dangers or defects in the regular inspection process and solve them. The principle is simple and reliable, and it will not be limited by the different structures and wiring of protection devices of different manufacturers.

[0020] It can quickly and conveniently test the direct resistance of the three-phase current loop in a short time and automatically record the data. It can also add AC current and voltage to perform functional inspection on the secondary monitoring and protection device. It also has the function of testing the insulation of the control loop. Maintenance personnel do not need to bring a lot of instruments and equipment, and can complete the inspection conveniently and efficiently, reducing the burden on maintenance personnel. It can also accurately find out whether there are hidden dangers in the circuit and ensure the reliability of power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0022] Figure 1 An overall flow chart of a method for integrating a direct resistance test and a fixed detection test of a secondary current loop provided by an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of a secondary current loop direct resistance test and fixed detection test system provided for one embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Example 1

[0027] Reference Figure 1 , as an embodiment of the present invention, provides a method for integrating a secondary current loop direct resistance test and a fixed detection test, comprising:

[0028] S1: Switch the instrument's function module to the load test module to perform internal function verification of the device;

[0029] Furthermore, open the corresponding voltage and current terminal connectors at the panel cabinet where the secondary monitoring and protection equipment is located, and use the current output port and voltage output port of the instrument to output AC voltage and current greater than the set parameters according to the set parameters of the secondary equipment, to simulate the AC current and voltage sampling collected by the secondary equipment when the primary equipment fails. At this time, the secondary equipment should be protected and the outlet should trip to verify that the protection function of the secondary equipment is correct and can operate normally in the power system. If the protection fails to trip, further investigation should be carried out;

[0030] Verify whether there is a device plug-in failure. If there is a problem with the device plug-in, extend the power outage interval of the equipment to avoid secondary equipment refusing to operate or malfunctioning, expanding the power outage scope. If there is no plug-in failure, check whether the function input wiring of the secondary equipment is loose. After confirming that the problem has been solved, proceed to the next step.

[0031] S2: Switch the instrument's function module to the resistance test module, determine the integrity of the secondary current loop by the difference in the direct resistance of the secondary current loop, and determine the status of the secondary wiring by the insulation resistance;

[0032] According to the document "Guidelines for Ensuring Safe Operation of Current Circuits (2023 Edition)" issued by the Southern Grid Dispatching Center, the deviation of the direct resistance value of the three-phase secondary current circuit between each phase should not be greater than 1Ω, and the direct resistance value of the three-phase current circuit cannot be greater than megohm. When any of the above situations exists, it is necessary to check from the current transformer body to the secondary monitoring and protection equipment. Excessive current circuit resistance will affect the normal operation of the secondary monitoring and protection equipment. In severe cases, it will directly damage the current transformer. The integrity of the secondary current circuit is judged by the direct resistance test module of the instrument, which can help maintenance personnel to promptly discover hidden dangers in the current circuit and deal with them as soon as possible.

[0033] Furthermore, the DC resistance test module is switched, and a DC current is passed into the secondary current loop of the secondary monitoring and protection device, and the resistance values ​​of the three-phase current loops A, B, and C are stably and accurately measured respectively, and the DC resistance values ​​of the secondary current loops of the three phases A, B, and C are compared. When the DC resistance value deviation between the three-phase secondary current loops is greater than 1Ω or the DC resistance value of the three-phase current loop is greater than 1MΩ, it proves that the current secondary current loop is incomplete, and the actions from the current transformer body inspection to the secondary monitoring and protection device are executed, otherwise proceed to the next step;

[0034] After verifying the direct resistance of the secondary current circuit of the secondary monitoring and protection equipment, the insulation of the control circuit should also be checked. Switch the insulation resistance test module. According to the requirements of the "Southern Power Grid Relay Protection Inspection Procedure" issued by the Southern Power Grid, for the DC circuit, use 1000V to measure the insulation resistance of the circuit to the ground and each other. When the resistance is less than 1MΩ, it means that the secondary wiring has insulation aging and damage. At this time, replace the spare core of the cable or re-lay the cable to avoid DC grounding or circuit breaker malfunction. If the resistance is greater than or equal to 1MΩ, proceed to the next step.

[0035] Furthermore, first go to the current transformer terminal box of the secondary equipment to open the secondary current loop terminal connector, and then use the instrument to test the direct resistance of the secondary current loop from the current transformer to the terminal box. If the test is qualified, you need to tighten the secondary current loop connection from the terminal box to the panel cabinet. If the test result is still the same as before, you need to first check whether the secondary wiring of the current transformer body is loose. If the test result does not change after tightening, the current transformer manufacturer needs to conduct an in-depth inspection to avoid affecting the normal operation of the secondary equipment.

[0036] S3: Switch the instrument's function module to the continuity test module, and test the core before connecting the secondary wiring to ensure that the wiring at both ends of the cable is consistent;

[0037] Furthermore, check all secondary wires in the secondary cable in turn, ground one side of the cable secondary wire, and use the test line of the instrument to measure whether the other side of the secondary wire is conductive to the ground. If not, it proves that they are not the same secondary wire and cannot be connected to the secondary circuit.

[0038] Example 2

[0039] Reference Figure 2 , is an embodiment of the present invention, providing a system for integrating direct resistance test and fixed detection test of a secondary current loop, comprising:

[0040] A load test module 100, a resistance test module and a continuity test module 300;

[0041] The load test module 100 is used to perform internal function verification of the device;

[0042] The resistance test module includes a DC resistance test module 200 and an insulation resistance test module 300. The DC resistance test module 200 is used to determine the integrity of the secondary current loop, and the insulation resistance test module 300 is used to determine the state of the secondary wiring.

[0043] The continuity test module 300 is used to test the core before connecting the secondary wiring to ensure that the wiring at both ends of the cable is consistent.

[0044] By switching to different functional modules, the internal functions of the secondary monitoring and protection equipment and the external secondary circuit performance can be verified. The load test module 100 is used to verify the internal functions of the secondary monitoring and protection equipment, while the conduction test module 300, the load test module 100 and the DC resistance test module are used to verify the external secondary circuit performance of the device.

[0045] The DC high-voltage current module 700 is used to output the 1000V voltage required by the "Southern Power Grid Relay Protection Inspection Procedure" document in the secondary DC circuit to detect the insulation resistance of the secondary DC circuit to the ground and each other. The AC current source module 500 is used to output the operating quantity or fault quantity required to be collected by the secondary monitoring and protection equipment. The DC low-voltage power supply module 800 is used to assist in testing whether the secondary wires at both ends of the cable are the same core wire. The DC power supply module 600 is used to assist in verifying the integrity of the secondary current circuit. When the DC resistance is measured to be too large, it proves that the secondary current circuit is virtual or disconnected.

[0046] Example 3

[0047] An embodiment of the present invention is different from the first two embodiments in that:

[0048] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program code.

[0049] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0050] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0051] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0052] Example 4

[0053] As an embodiment of the present invention, a practical application example of a method integrating a direct resistance test and a fixed detection test of a secondary current loop is provided.

[0054] In a protective device misoperation accident, after the secondary monitoring protection equipment was inspected, the maintenance team forgot to restore the repaired current circuit connector, resulting in a misoperation of the protective device and a power outage when the line resumed operation; there was another protective device misoperation accident similar to the previous case. Because the winding of the current transformer was insufficient, when the secondary current circuit was connected in series with multiple devices, the current wiring at a certain device was loose, resulting in an abnormal current circuit and misoperation of the protection. During the regular inspection of the 35kV main transformer, it was found that the main transformer protection was operating correctly, but the transmission could not be opened to trip the main transformer circuit breaker. After on-site inspection of the device, it was found that the trip node of the secondary equipment plug-in was damaged. Replacing the spare trip node can not only protect the normal operation and trip the main transformer circuit breaker, but also avoid accidents such as primary protection refusal to operate, protection overstepping, and expansion of power outage scope. A method integrating secondary current loop direct resistance test and regular inspection test provides a device different from using a multimeter to test the direct resistance of the current loop, which brings convenience to maintenance personnel. It can quickly record and test the direct resistance of the three-phase current loop, and judge whether the secondary current direct resistance loop is operating normally through the test results. If there are hidden dangers, they are dealt with in time to avoid affecting the safe and stable operation of the power grid.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for integrating direct resistance test and fixed detection test of secondary current loop, characterized in that: include: Switch the instrument's function module to the load test module to perform internal function verification of the device; Switch the instrument's function module to the resistance test module, determine the integrity of the secondary current loop by the difference in direct resistance of the secondary current loop, and determine the status of the secondary wiring by the insulation resistance; Switch the instrument's function module to the continuity test module, and test the core before connecting the secondary wiring to ensure that the wiring at both ends of the cable is consistent.

2. The method for integrating direct resistance test and fixed detection test of secondary current loop as claimed in claim 1, characterized in that: The internal function check of the device includes: Open the corresponding voltage and current terminal connectors at the panel cabinet where the secondary monitoring and protection equipment is located. According to the set parameters of the secondary equipment, use the current output port and voltage output port of the instrument to output AC voltage and current greater than the set parameters to simulate the AC current and voltage sampling collected by the secondary equipment when a primary equipment failure occurs. At this time, the secondary equipment should be protected and the outlet should trip to verify that the protection function of the secondary equipment is correct and can operate normally in the power system. If the protection fails to operate and the outlet trips, further investigation should be carried out.

3. The method for integrating direct resistance test and fixed detection test of secondary current loop as claimed in claim 2, characterized in that: The further investigation includes verifying whether there is a device plug-in failure. If there is a device plug-in problem, extend the power outage interval of the equipment or replace the faulty plug-in in time to avoid secondary equipment refusing to operate or malfunctioning to expand the power outage scope. If there is no plug-in failure, check whether the function input wiring of the secondary equipment is loose. After confirming that the problem has been solved, proceed to the next step.

4. The method for integrating direct resistance test and fixed detection test of secondary current loop as claimed in claim 3, characterized in that: The integrity of the secondary current circuit includes: Switch the DC resistance test module, pass DC current into the secondary current loop of the secondary monitoring and protection equipment, stably and accurately measure the resistance values ​​of the three-phase current loops A, B, and C, respectively, and compare the DC resistance values ​​of the secondary current loops of A, B, and C. When the DC resistance value deviation between the three-phase secondary current loops is greater than 1Ω or the DC resistance value of the three-phase current loop is greater than 1MΩ, it proves that the current secondary current loop is incomplete, and the actions from the current transformer body inspection to the secondary monitoring and protection equipment are executed, otherwise proceed to the next step; Switch to the insulation resistance test module and use 1000V to measure the insulation resistance of the loop to ground and each other. When the resistance is less than 1MΩ, it means that the secondary wiring has insulation aging damage. At this time, replace the spare core of the cable or re-lay the cable to avoid DC grounding or circuit breaker malfunction. If the resistance is greater than or equal to 1MΩ, proceed to the next step.

5. The method for integrating direct resistance test and fixed detection test of secondary current loop as claimed in claim 4, characterized in that: The inspection from the current transformer body to the secondary monitoring and protection equipment includes first opening the secondary current loop terminal connector at the current transformer terminal box of the secondary equipment, and then using an instrument to test the direct resistance of the secondary current loop from the current transformer to the terminal box. If the test is qualified, it is necessary to tighten the secondary current loop connection from the terminal box to the panel cabinet. If the test result is still consistent with the previous one, it is necessary to first check whether the secondary connection of the current transformer body is loose. If the test result does not change after tightening, the current transformer manufacturer needs to conduct an in-depth inspection to avoid affecting the normal operation of the secondary equipment.

6. The method for integrating direct resistance test and fixed detection test of secondary current loop as claimed in claim 5, characterized in that: The core detection before secondary wiring includes checking all secondary wires in the secondary cable in turn, grounding one side of the secondary wire of the cable, and using the test line of the instrument to measure whether the secondary wire on the other side is conductive to the ground. If not, it proves that they are not the same secondary wire and cannot be connected to the secondary circuit.

7. A system using the method for integrating direct resistance test and fixed detection test of a secondary current loop as claimed in any one of claims 1 to 6, characterized in that: include: Load test module, resistance test module and continuity test module; The load test module is used to perform internal function verification of the device; The resistance test module includes a DC resistance test module and an insulation resistance test module, wherein the DC resistance test module is used to determine the integrity of the secondary current loop, and the insulation resistance test module is used to determine the state of the secondary wiring; The continuity test module is used to test the core before connecting the secondary wiring to ensure that the wiring at both ends of the cable is consistent.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the integrated secondary current loop direct resistance test and fixed detection test method described in any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for integrating the direct resistance test and the fixed detection test of a secondary current loop according to any one of claims 1 to 6 are implemented.

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